-LRB- CNN -RRB- -- Chronic seizures can present a risk for adolescents , whose bodies and metabolism are changing .

Jett Travolta was the elder of John Travolta and Kelly Preston 's two children .

A seizure disorder caused the death of Jett Travolta , the 16-year-old son of actors John Travolta and Kelly Preston , a source at a Bahamas funeral home told CNN .

`` Literally dozens of different disorders can cause seizures : genetics , stroke , brain tumor , lack of oxygen , low blood sugar , drugs , even certain medications , '' said Dr. Sanjay Gupta , CNN 's chief medical correspondent .

Another expert said the teen years bring risks for those with seizures . `` Adolescence is a time , even if you do n't talk about children with any seizure disorder , where things change in a child , '' said Dr. Shlomo Shinnar of Montefiore Medical Center in New York .

There are effective drugs to treat seizures . As children grow , their bodies and metabolism change , perhaps causing a need to adjust their dosage , said Shinnar , a professor of neurology and pediatrics and director of the Comprehensive Epilepsy Management Center at Montefiore .

`` Seizures during adolescence can get better or worse or stay the same , '' he said .

And the risk of seizures is higher for children with disabilities such as autism and cerebral palsy , Shinnar said .

Jett Travolta had a developmental disability that his parents have linked to Kawasaki disease , an inflammatory disorder of the artery walls that most commonly occurs in young children .

An autopsy of the actors ' son was completed Monday , and the body was cremated that evening , the funeral home source said .

Jett was found unconscious in the bathroom Friday while on vacation with his family . Michael Ossi , an attorney for Travolta , told CNN last week that Jett had a seizure that morning at the family 's home in a resort area . He was taken by ambulance to a hospital and pronounced dead on arrival , according to local police .

People.com reported that Travolta , Preston and their 8-year-old daughter Ella Blue arrived in Florida on Monday night with Jett 's ashes . The reports that a seizure disorder caused Jett 's death were preliminary , Gupta said .

`` It tells us more about what did not happen than the ultimate cause of death . It rules out brain injury , bleeding on brain , skull fractures , rules out heart problems due to Kawasaki disease , which is the disease the Travoltas say their son suffered , '' he said .

Kawasaki disease , believed to be caused by an infection , inflames the heart muscles . In 2001 , Travolta told CNN 's Larry King that his son had a near brush with death related to the condition .

`` I was obsessive about cleaning -- his space being clean , so we constantly had the carpets cleaned . And I think , between him , the fumes and walking around , maybe picking up pieces or something , he got what is rarely a thing to deal with , but it 's Kawasaki syndrome , '' Travolta said of his then-2-year-old son .

Dr. Cam Patterson , general cardiologist at the University of North Carolina and a genetics expert who follows Kawasaki disease , told CNN , `` There is no real good link at all between Kawasaki disease and cleaning products .

`` Kawasaki disease is due to an abnormal immunnologic response , probably to an infectious agent or infection we do n't yet understand , '' Patterson said . `` There is nothing that links environmental toxins to this problem . ''

Someone with Kawasaki could have seizures for one of two reasons , but they would be rare , he said .

`` One , sometime in the past one of the arteries in the brain ruptured and caused stroke , '' he said . `` Two , if the artery had enlarged enough , it could be pressing on parts of brain and that could cause seizure . Both possibilities are unusual for Kawasaki disease . ''

A very small study released in 1991 found an association between cases of Kawasaki disease in homes where carpet had been cleaned in the past 30 days .

`` It 's very easy to find correlations , but does n't mean causative , '' Patterson said .

The next step would have been to conduct more tests , by taking toxicological tests and brain examinations to see what could have caused the seizure .

`` Even with physical evidence and a deeper look by neuropathologists , we still may never have an answer , '' Gupta said on CNN 's American Morning .

CNN 's Stephanie Smith and Miriam Falco contributed to this report .

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Seizures in teenagers can be caused by dozens of disorders , genetics

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Seizure said to have caused the death of Jett Travolta , 16

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Family has linked seizures to Kawasaki disease ; experts say it 's unlikely